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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bba6917af2b506daf9341427952657b9063949ae252207600df874acc075d7' 
  AND token = 'INv+VO1Jb3HOUgx6tNQ/ltN1kB4vsSvs4GZpI1bi9Cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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