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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03880de9449e84da51e552e2fd833fd88540e00d964a73f37058e9b8058149c3' 
  AND token = 'dKMW5XiOn5bbi2pl1Fj1agbYSIP1SXhuqJzrDLlcYpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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