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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba64bda2c5a3ee040958b2d9279d721988f343d2d9ba35d254ccce710e64413' 
  AND token = '6GQ10FFXrR9iS4o1E8hWNSQdtNUZam5vkxWPXh6cugo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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