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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6227b9fb44cbb1bc979c71c58fee6b8a9bb30423150a8710278f12ab1fee76d9' 
  AND token = 'pLHkLCX0ddSezOhnFHNJ3njYW8SPGeqhZOMJGSokkHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00148

JSON explain

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