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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c1b1c9a9687cef3b8391d9914b45ac28416e5e79991c76cf9595e7c336d35a' 
  AND token = 'mGUchMvi/ekrVGSy41sN9+f/dE5TuVYRI+JvljV9mOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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