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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f303f7235f85da050925bd7795cc26dbe4e0f9cee91f8f495d20747d41de7c' 
  AND token = 'Bh6l3B+QEaGIko9KPZWBCYGIeApNTjOXLoadRYerA4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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