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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e740a6dbef58a7e4695bb11c1e580469e7eef3c8e346d54712f2d661ff1ab5' 
  AND token = '15y5X/US8h8THIbKMRWMKHgAtBWYnoNtuyod0OUACeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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