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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d0d7463c05da1d93ce5e251b2354e128bf0ead15c1784e982bad6ee052d658' 
  AND token = 'CwkaVvX9uXYNu11xN5e4/2lftSpiAB3T6UBl2D54Af0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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