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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26af6439a8b1f4f2eb07b404d88392baf91e2d0c9e857722a0695302171a9c13' 
  AND token = 'S8uM05AbagEExTHzQdJhojRh5TFQccqTwIXPfwpgBuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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