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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37a103dba2c4c4a239b74d736b0a84b1b8ab58a47c8e0f1c0f1c26d8c396659' 
  AND token = 'zVXLkVlt1+pqTsT0oQElol1l0AIEkVtFyOF0SFl8fSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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