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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43360d684b3608fbf23e44ff4b4adae25f16756cea9084e953c5c81fe7a42ae6' 
  AND token = 'SfoB48DnJSE20s0FOYA6Y3Cc8UX2uI7L/t0NR0UqH+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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