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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aac870e9e01870f1724fd80597197ae1f9d97931eed04a86a963a9adf7103f5e' 
  AND token = '1O7kiQZNJRgo4lfgS0q2p++AEdh5cVsG8MZ23Kx9SRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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