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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75258d2d09c9394f6f706ce0c8902ce1534e7241947caf0dd797e83cbfa0d81a' 
  AND token = 'RXnzByGdNTZ8B6RnRqH0lLnTnBE21ezEy3BWU1pl8vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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