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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd99f1b54f1fedd8e0afae514973b9884e19c5d3038633b4550b3e14bc374d83' 
  AND token = '7VzyFVLaSNn8PWMfCEhFJmno1+340s/ukDIYzS4m0dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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