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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28195925511747bdb60787dbc4cc4bf281dedec67ce5c7caa5a95b81ab9d17bd' 
  AND token = '8Bw3vjWXeRnwz8uy+3tjVIjvB1Pp692U2JpNym1O8qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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