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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eceaf79ea4312f2a0837d8a3ea9442acf6f661332916e0bda3590c2cf1bd0cd6' 
  AND token = '4WN8DH2a9O/fuG3C5El6rviLjoYE32/Fjr0VX343ago=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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