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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '121195a0a909a74817a2a2a7f6f9fec09d0b58ce3f9c37ce8de97eff6ae4757e' 
  AND token = 'zaMbb5bC4DJVJzbX2M1FpMucwi8VShWk74zPG7i2W+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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