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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3da8a27c6842ace1f9429f65e26b6bc837bf999d01d7a89c15f1537c9fc536d' 
  AND token = 'ifVRPedezNiebUoxvfARSmhu35whOEG8lg4lZ9N4g/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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