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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f527c85d2b4ac623aa056b2a93d00888bfb064aba62c000069ec7703b6fd114' 
  AND token = 'vyLSMakdo3rjEijkZBmcCgiCfd1y6nWyJSn2lP8Jz0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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