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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aae68d43129c1baab669ff2d06456c958a02f9aca5aa9f9f9027bd6da399af98' 
  AND token = 'N3kIf+sSqlh6xgmI78/4/T7LB90PIhVyUBnOY7XczhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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