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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925e46887120fb6f25f5f0f7e008fa5c6f90c118d4fca7d136916da2c349bb2e' 
  AND token = 'UjRLFybqymCkYMk/MAZbLiMFjfe83/2lU1FNY07zbg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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