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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab150afe677d3cb296ec679250b4a3192d69eb2cf773a631a40b10338fb2f2da' 
  AND token = '7ICFWHrkDhg3zIlhUzFtRyQZMieV2ws2ZW8iDI7SrFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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