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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c7b55208e99cdb8aff0b2096ebd04bf8c6564904013f6b618e6ed59e109ccd' 
  AND token = '0YFXp0X9zAe0uRKVxsb1snYS7PF8ZXdt6AHfvuBx+ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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