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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b929e4d3f65fe1eff7ddf2799e4a92f225502d5859d0825c05be075483acf440' 
  AND token = 'mY67G1OH9B8GgzJ2djR8ArjgstZXDXq36a6WqOw4z4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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