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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd8ef7d78509f917787d57893702f9af0f6e268fa5acc5a5e24fc4b78ac771f' 
  AND token = 'zkc0X6tur4iEdFSvIXZ7FaUMBBBMt0qC7C0JdmjjIhw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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