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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b2077fecf6b7f9269d70d9d98b63578453bc4fb88d57e56e34033b893ac61e' 
  AND token = 'yD5MK1uSKG3w2e+73pOm6AiCqDr3t8mjaUCNLbp8le0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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