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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed37a2c1881d61335d0ec7811bc05c7f9c56a5d032e3550aa3f7458dc19c582d' 
  AND token = 'vJ/aDFL28dTd0pxpk6Ex5Iyffa5Ngfe2udyWvng4bSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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