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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa56efbb68044e26939d13f056ef9b3a2bf462fa1963e338090b8b294eb63f96' 
  AND token = 'tOVEr1jBNxvcAF73xhIdrGd3rT9xbSDu/DhwG84FWSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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