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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a13b85b1400ca6691f0bc816c41a5bfa5cefc30279bf88b45665a18134ec001' 
  AND token = 'WnGjiri7R+6VBf5zuhRhv7iWjIXR8P39UV1TQkW821w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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