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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02f46c8dc47ef7792699baa3d96144a3425be409764504533906d56b8e9d2b3' 
  AND token = 'D03foNZWk2Hiu9bm8Tl0YrNcGvrtDj0u4HEUCm8B7PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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