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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0c7dd6b06407e5c054119c084967cfa490caa064629b2a1f7147bc4f9a0dc3' 
  AND token = 'LBRl3DGu0N8IVSCodLvvXgmsrNQczfC0QqLsenAfGhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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