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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09321bf7098a1c84d1f987f7a06ac1f5ca2cad03663c63edd4dd908d4a4f2ace' 
  AND token = 'Mvq9f7ODNDB2tZGsKZ7g6F+fBbG08YMKIwHVyIgRCc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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