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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bbb703c61ce138c2c8c4a11c4e3461a79af7a22ba9ad16dbc647491ed46ef91' 
  AND token = 'O8J8krcU317j5p5dCPegrBG/CQKSI+rbzQhQltyAjgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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