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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3c108dba4ee2775d548dd20294f82c9c1aaaf9633af900c47c3f3a0923c87b' 
  AND token = 'imgRZkkiE31AYIY06fviEbO82fE8g+L8qsrJuDyjEGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}