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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac876d133bc937d3f6aaf4367ca576aa392c6f90c4897ddcf2bcfdf0ceca9379' 
  AND token = 'zir5/ofXnLD90gLCvl7+Xr1Op5+2yV5cuuCcvVqNNUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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