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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1356b464f14fe033fabe8df43c478731aadb4f0d8cb31d7283f3c63027297c3f' 
  AND token = '5OE2YZg2rHCi8tiMrO4WG1Or7FvOe8zhRET4Pd9gx70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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