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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e9f3b543289ebdba82a19db2de7ac9af198839858e9a872451b98df19fc55fb' 
  AND token = 'wiX76TUl3fuvFiipzKL8CDsS5/bkl+iVavjsnEmhpWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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