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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa423cdbdef0c31409d3574a3c855c5fefe65081dc3f749aa0a37c4faa00e462' 
  AND token = 'X5US2MGSrtrRqcwSnJIU9Ckvwlbp/aeT34Jrq0h4/vA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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