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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b748d6986ea7a0dbfe89ab7c0b6cfa5dc7e18a04cd73c28d5b3a192ccab6d2b6' 
  AND token = 'moWYj36/jYcdK2h1IOBLgTttI3Lq2aQP1EmIS1oLj2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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