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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e09712cb2165851cefd3218ad59116b266fe6b0113e768435328b1bcad2b32d2' 
  AND token = 'r9+93uVQU6PsWp3p5Iq0e2lOotzvXG6hSFrxI+U9Tsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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